Monooxorhenium(V) complexes with the tridentate Schiff base N-(2-hydroxyphenyl)salicylideneimine

The reactions of the tridentate Schiff base ligand N-(2-hydroxyphenyl) salicylideneimine (HOPhsalH) with oxotetrachlororhenate (IV) have been investigated. The complexes (Bu4N)[ReOCl3(HOPhsal)], (Bu4N)[ReOCl2(OPhsal)], cis- [ReOCl(MeOH)(OPhsal)], trans-[ReOCl(MeOH)(OPhsal)] (1), trans-[ReOCl(OH2)(OPhsal)] · Et2O (2), trans-[ReOCl(OH2)(OPhsal)] · Me2CO, cis-[ReOCl(PPh3)(OPhsal)], cis-[ReOCl(PMe2Ph)(OPhsal)](3) have been synthesized and characterized. The crystal structures of (1), (2) and (3) have been solved from three-dimensional x-ray data by Patterson and Fourier methods and refined by least-squares methods to R 0.10 for (1), 0.042 for (2) and 0.059 for (3). In all the three complexes, the ligands surrounding the rhenium atom are at the apices of a distorted octahedron, with the equatorial ONO donor atoms of the tridentate Schiff base bent away from the Ooxo and toward the loosely bound MeOH in (1), H2O in (2) and Cl in (t3). The fourth equatorial substituent is Cl (1 and 2) and PMe2Ph (3) and the rhenium atoms lie 0.30-0.37 Å above the best plane through the four equatorial atoms, in the direction of the Ooxo. All interatomic distances and angles are normal. © 1985 VCH Verlagsgesellschaft mbH.